package leetcode.code0297;


import leetcode.helper.tree.TreeNode;

/**
 * 执行用时：13 ms, 在所有 Java 提交中击败了71.56%的用户
 *
 * 内存消耗：39.9 MB, 在所有 Java 提交中击败了88.34%的用户
 *
 * 通过测试用例：52 / 52
 */
public class Codec {
	// Encodes a tree to a single string.
	public String serialize(TreeNode root) {
		if (root == null) {
			return "";
		}
//		Queue<TreeNode> queue = new LinkedList<>();
//		queue.add(root);
		MyQueue queue = new MyQueue((int) 1e4 + 1);
		queue.add(root);
		int levelSize = 1;
		StringBuffer ans = new StringBuffer();
		int emptySize = 0;
		while (!queue.isEmpty()) {
			levelSize = queue.size();
			if (emptySize == levelSize) {// 这一层全是空，不玩了
				break;
			}
			emptySize = 0;// 记录下一层null的数量
			while (levelSize > 0) {
				TreeNode tn = queue.poll();
				if (tn != null) {
					ans.append(tn.val).append(",");
					queue.add(tn.left);
					queue.add(tn.right);
					if (tn.left == null) {
						emptySize++;// 添加了一个null到下一层
					}
					if (tn.right == null) {
						emptySize++;
					}
				} else {
					ans.append("null").append(",");// null占位
				}
				levelSize--;
			}
		}
		return ans.deleteCharAt(ans.length() - 1).toString();
	}

	// Decodes your encoded data to tree.
	public TreeNode deserialize(String data) {
		if (data == null || data.equals("")) {
			return null;
		}
		String[] datas = data.split(",");
		int len = datas.length;
		TreeNode ans = new TreeNode(Integer.valueOf(datas[0]));
		int levelSize = 1;// 队里新添加了几个点
//		Queue<TreeNode> queue = new LinkedList<>();
		MyQueue queue = new MyQueue((int) 1e4 + 1);
		queue.add(ans);
		int p = 1;// index==0作为第一个点默认加入队列了。所以数组从index==1的位置开始。
		TreeNode tn = null;
		while (p < len) {
			int curLevel = levelSize << 1;// 这一层要处理的数量是新增点数量的2倍。
			levelSize = 0;// 新增点归零。
			while (curLevel > 0) {
				if ((p & 1) == 1) {// 奇数点取上一层的父节点
					tn = queue.poll();
					if (p < len && !datas[p].equals("null")) {
						tn.left = new TreeNode(Integer.valueOf(datas[p]));// 奇数点添加左树
						queue.add(tn.left);
						levelSize += 1;
					}
				} else {
					if (p < len && !datas[p].equals("null")) {
						tn.right = new TreeNode(Integer.valueOf(datas[p]));// 偶数点添加右树
						queue.add(tn.right);
						levelSize += 1;
					}
				}
				curLevel--;// 这一层处理的数据量-1
				p++;// 被处理数组向后移动1
			}
		}
		return ans;
	}

	class MyQueue {
		TreeNode[] elements;
		int R;
		int L;
		int n;
		int size;

		public MyQueue(int n) {
			this.n = n;
			elements = new TreeNode[n];
			R = -1;
			L = -1;
			size = 0;
		}

		public TreeNode poll() {
			size -= 1;
			L = this.move(L);
			return elements[L];
		}

		public int size() {
			return size;
		}

		public boolean isEmpty() {
			return size == 0;
		}

		public void add(TreeNode root) {
			R = this.move(R);
			elements[R] = root;
			size++;
		}

		private int move(int index) {
			return (index + 1) % n;
		}
	}

	public static void main(String[] args) {
		Codec codec = new Codec();
//		TreeNode root = new TreeNode(1);
//		root.left = new TreeNode(2);
//		root.right = new TreeNode(3);
//		root.right.left = new TreeNode(4);
//		root.right.right = new TreeNode(5);
//		root.right.left.left = new TreeNode(6);
//		root.right.left.left.right = new TreeNode(7);
//		String ans = codec.serialize(root);
//		System.out.println(ans);
		TreeNode tn = codec.deserialize(
				"6,9,2,6,8,8,6,7,9,9,2,4,0,0,7,8,4,4,3,4,8,5,1,3,2,8,4,6,0,2,0,8,5,0,9,9,3,8,9,7,7,4,2,2,0,1,8,7,2,9,6,7,8,3,7,5,7,1,9,3,4,0,6,1,1,5,0,3,0,5,8,3,8,3,1,7,8,8,0,1,4,2,1,1,7,7,3,7,2,3,5,8,8,8,5,7,9,4,6,9,2,6,5,1,6,6,4,8,1,5,0,9,9,2,1,4,3,4,2,2,2,5,8,1,1,2,0,7,9,9,7,2,9,2,8,0,4,8,5,7,7,4,8,2,1,2,2,6,3,7,0,1,4,7,9,7,6,8,3,5,3,2,0,1,6,7,2,5,2,9,5,0,8,5,7,6,7,1,7,9,0,3,5,9,3,1,9,1,0,3,1,6,1,5,2,0,4,8,6,3,4,9,4,8,4,4,1,0,5,3,3,9,1,6,4,3,8,6,8,9,1,9,9,8,1,5,6,0,9,9,7,3,9,6,7,0,5,2,0,6,9,6,7,1,1,9,3,1,5,6,0,4,3,3,9,0,4,4,5,0,6,2,5,9,7,5,1,7,3,3,0,6,4,1,7,2,9,3,3,6,3,8,6,0,6,4,3,7,3,1,2,8,5,3,4,8,1,8,3,8,1,0,2,8,4,5,9,1,4,2,0,3,9,1,1,5,4,7,5,6,0,4,3,5,7,3,6,5,6,4,9,6,4,4,5,4,8,8,8,6,2,2,2,8,5,2,2,6,1,9,0,9,1,4,8,4,2,4,5,1,8,6,7,0,5,9,2,7,2,2,3,6,9,7,6,0,6,0,7,8,8,9,5,5,5,2,1,2,2,6,2,9,6,5,2,8,7,3,6,0,4,4,3,3,6,4,0,9,4,2,1,5,7,7,3,9,7,3,2,6,5,0,9,5,8,2,2,3,2,4,7,0,5,1,5,1,1,3,0,7,9,9,5,9,8,5,5,9,4,2,9,4,2,1,8,1,4,7,8,5,7,3,8,8,0,6,0,0,0,3,1,3,1,2,0,4,3,3,0,2,3,9,7,7,7,5,7,7,6,2,1,1,5,8,0,4,9,6,4,1,8,4,6,2,7,2,5,7,3,6,0,6,4,3,5,8,1,7,1,1,3,6,3,0,6,3,9,4,7,4,7,8,4,3,0,7,4,1,8,8,5,9,0,4,7,9,8,3,3,9,5,4,1,3,9,8,8,0,4,0,0,9,6,2,3,5,5,8,5,7,9,4,7,2,8,3,3,6,2,0,5,5,9,6,9,4,5,6,6,3,7,1,4,7,2,1,8,3,0,5,8,1,4,6,9,2,3,5,2,6,1,2,8,9,9,8,5,9,5,2,9,4,4,1,5,9,6,9,5,5,5,3,1,1,5,8,2,9,7,1,7,0,0,9,1,8,9,2,3,0,5,1,2,0,8,4,8,9,3,4,4,8,4,1,7,0,4,7,0,7,2,1,8,6,8,8,7,3,6,0,9,5,5,0,4,8,4,1,9,0,6,9,0,0,3,2,2,2,3,9,9,9,7,8,5,5,0,1,2,9,5,2,4,2,9,3,4,5,6,5,0,2,5,9,4,9,0,6,9,3,5,4,3,3,4,7,8,6,9,1,9,7,3,5,2,2,7,9,3,8,0,4,2,0,1,2,2,4,2,8,7,1,2,1,9,8,5,4,9,7,6,0,4,4,4,6,7,7,1,3,9,5,1,8,7,1,6,4,3,7,7,2,5,6,4,4,1,1,2,9,8,5,3,2,0,6,8,4,6,5,6,5,7,7,9,1,9,9,6,2,4,2,3,0,5,2,9,7,8,3,8,6,0,4,8,7,2,2,2,4,2,0,6,3,7,7,3,3,8,9,7,8,1,0,4,5,1,6,9,5,2,9,8,3,4,7,3,7,6,9,5,7,6,4,3,3,2,9,0,9,8,9,3,3,7,5,0,9,5,2,4,5,6,6,5,1,9,1,5,1,3,5,6,2,4,2,0,4,5,3,1,6,3,5,1,5,5,7,5,7,8,4,1,4,1,5,0,9,6,6,2,4,4,2,5,4,9,7,4,1,1,5,1,9,9,0,1,6,6,0,0,6,8,4,3,2,9,4,6,1,3,4,0,9,7,1,4,6,8,1,2,3,6,2,7,8,9,6,1,2,4,8,9,5,7,2,6,3,9,4,2,9,7,2,5,0,0,2,5,0,3,6,1,1,7,0,7,6,0,2,3,6,0,6,3,8,6,1,9,6,8,2,9,8,8,2,7,6,4,2,3,3,8,8,4,7,9,2,7,3,6,6,8,6,2,1,0,4,4,7,0,2,9,7,5,0,3,5,8,4,3,9,2,4,5,0,2,5,6,9,5,4,9,4,3,9,2,7,5,5,1,6,5,5,7,1,1,6,2,0,2,2,9,7,8,6,5,8,4,5,3,9,0,9,9,5,4,0,4,9,5,6,1,4,2,4,6,0,1,8,9,1,4,4,4,4,1,6,7,6,6,6,5,2,6,3,6,5,4,6,0,4,1,0,7,8,5,3,9,2,5,5,3,7,5,9,2,6,5,1,9,5,4,8,2,1,2,1,6,1,0,0,8,8,5,3,8,7,4,8,6,3,5,1,3,4,4,9,0,9,3,3,1,7,5,9,4,9,0,2,1,5,5,6,6,8,4,7,2,5,4,4,8,4,1,6,1,4,1,2,0,5,2,3,0,9,4,6,2,5,3,9,3,3,6,2,1,5,3,9,0,1,2,0,7,5,3,7,7,0,9,5,6,7,0,6,3,0,7,5,2,9,5,8,7,8,0,9,5,2,6,0,4,4,7,9,9,2,0,7,0,0,7,6,7,7,7,9,6,6,5,5,8,0,2,5,7,4,6,7,5,2,0,7,7,4,2,7,0,3,3,8,6,5,8,2,3,9,2,9,9,7,6,7,0,5,0,8,2,1,9,3,2,3,0,5,6,7,8,7,7,4,9,0,9,4,6,2,8,6,0,1,2,1,9,3,9,8,6,4,5,2,1,3,2,4,8,6,8,1,4,0,9,0,8,3,9,6,7,1,1,6,2,2,8,4,9,0,4,1,7,6,9,7,7,0,1,0,3,8,1,7,7,0,0,4,8,3,7,5,6,7,0,5,8,7,3,3,9,0,0,8,4,2,3,0,5,4,1,6,8,8,5,9,2,7,7,0,6,4,5,6,7,0,5,9,5,8,0,5,1,8,3,7,4,5,9,4,6,2,7,1,3,2,0,0,2,1,4,9,9,1,4,6,3,3,1,0,4,6,9,3,3,9,5,6,1,2,5,0,4,1,2,1,7,8,2,4,9,9,6,4,1,7,2,1,4,6,5,2,2,2,8,5,9,2,6,0,3,8,6,2,4,4,6,2,1,3,2,4,7,1,3,4,5,6,2,4,0,0,7,2,4,7,5,2,6,3,5,3,4,1,5,3,3,2,0,8,2,3,7,1,9,0,2,5,0,7,7,4,3,7,2,4,6,8,2,0,5,1,4,4,4,2,5,4,5,6,5,9,8,4,6,1,7,1,3,3,4,5,2,7,9,7,6,4,9,9,7,9,9,9,7,2,8,4,3,5,1,1,0,4,2,1,7,7,2,0,8,9,1,6,0,0,4,4,7,2,9,2,0,8,6,9,8,6,5,4,4,5,0,8,4,3,8,9,7,2,9,7,6,6,3,1,1,0,7,0,4,6,4,3,4,7,6,5,1,5,7,0,2,0,2,6,4,2,9,2,5,3,1,4,6,8,7,8,8,3,7,7,8,9,7,5,4,7,1,9,9,3,9,8,2,2,9,4,5,9,0,7,2,3,1,9,7,5,4,6,3,5,1,2,5,2,7,6,0,9,7,0,3,2,9,0,9,1,0,2,1,5,9,6,7,4,0,1,6,8,9,3,1,4,1,6,6,1,0,7,5,7,2,7,2,6,2,6,6,0,6,8,6,6,8,3,8,5,4,8,4,5,3,9,1,7,0,6,6,3,4,2,0,3,2,5,5,7,0,4,4,7,0,6,2,0,3,6,3,4,7,8,6,6,7,3,4,2,9,7,6,9,7,5,9,5,3,6,9,7,7,6,9,7,5,2,9,2,7,0,5,3,9,2,9,1,1,1,6,9,7,8,6,9,1,4,4,3,9,2,6,5,9,1,2,9,7,2,5,0,1,3,3,2,8,8,3,4,4,3,4,3,4,2,0,5,7,1,8,7,9,9,7,6,7,6,7,3,4,0,1,3,9,7,0,3,7,9,2,5,2,6,6,3,2,7,3,9,4,2,0,8,7,5,3,2,3,7,0,6,1,6,2,2,1,9,4,1,3,7,7,9,0,5,0,9,6,6,4,2,8,8,1,6,5,5,6,6,1,1,5,6,2,4,6,5,2,6,7,3,3,9,0,3,9,9,1,8,5,1,4,5,3,5,9,2,8,6,8,8,7,1,1,5,8,4,1,8,2,5,0,9,0,8,7,3,8,2,1,8,4,5,7,3,6,7,7,2,2,0,8,2,0,0,7,9,7,0,8,4,5,1,3,8,3,5,6,7,2,5,2,7,5,1,3,5,9,0,6,3,1,8,2,1,2,6,8,8,7,2,5,4,8,9,7,8,9,1,2,6,0,8,1,8,7,7,5,5,4,8,3,8,6,4,4,9,9,2,8,5,3,1,3,3,0,8,4,5,8,4,8,8,3,2,7,1,1,6,9,6,7,2,1,8,0,6,5,2,2,1,2,8,7,7,4,1,2,0,1,0,4,9,5,1,8,2,8,1,0,4,5,7,9,2,7,9,2,4,9,9,4,8,1,5,4,3,9,9,5,8,2,8,7,8,9,0,0,4,9,6,3,6,5,0,4,8,1,6,3,5,7,6,0,7,8,4,8,4,6,8,1,0,3,5,8,6,1,0,3,8,3,1,6,6,8,9,4,4,0,6,4,4,1,2,4,3,1,0,4,0,5,3,2,9,0,6,3,3,6,1,3,7,3,8,8,3,6,9,7,2,5,5,2,3,5,5,7,1,4,0,1,7,8,7,1,4,4,3,2,3,6,3,9,3,4,0,6,0,2,7,1,9,8,9,0,3,4,8,1,2,8,4,0,9,5,5,9,0,5,3,0,9,9,7,9,5,7,0,5,2,7,0,7,7,3,6,3,5,8,0,7,8,4,3,1,9,5,9,0,8,6,5,0,9,4,8,4,1,1,2,0,8,2,9,8,8,9,4,1,2,2,1,0,0,6,8,8,1,6,1,7,2,1,7,9,4,4,0,9,4,3,1,1,2,5,5,8,4,8,4,4,7,4,2,5,9,4,8,4,9,4,3,7,2,2,5,2,4,5,9,7,3,7,8,4,2,4,9,3,0,1,0,3,8,3,7,3,9,2,1,9,1,0,9,0,2,5,2,4,2,7,0,9,1,4,2,2,3,9,0,2,8,1,6,1,8,9,9,1,8,3,3,7,9,0,8,8,8,7,7,8,2,5,8,5,7,1,5,2,6,0,8,1,7,8,0,0,2,2,3,7,3,9,5,7,0,2,1,3,4,6,2,2,8,6,5,2,2,2,1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,7,5");
		System.out.println(codec.serialize(tn));
	}
}
